Laminate composition comprising polyetherimide impregnated fabric

Abstract

A laminate having desirable physical and high temperature properties is described. The laminate is composed of a conventional fabric material impregnated with a polyimide reaction product of substantially stoichimetric amounts of bis(etheranhydride) with a diamine compound, said reaction product being cross-linked with a tri-functional isocyanate agent.

I claim: 
     
       1. In a laminate composition comprising a ply of fabric material impregnated with a solid resin binder, the improvement wherein said resin binder comprises polyetherimide reaction product of aromatic bis(etheranhydride) with organic diamine, said reaction product being cross-linked with tri-functional isocyanate agent. 
     
     
       2. The composition of claim 1, wherein the diamine is an aromatic diamine. 
     
     
       3. The composition of claim 1, wherein the aromatic bis(etheranhydride) is reacted with from 0.5 to 2 mole of diamine. 
     
     
       4. The composition of claim 1, wherein the aromatic bis(etheranhydride) is a bis-phthalic anhydride of the formula: ##STR8## wherein each of R 1  and R 2  is an alkyl group of from 1 to 4 carbons; each X is selected from the group of a halide, an alkyl of 1 to 2 carbons and hydrogen. 
     
     
       5. The composition of claim 4, wherein the anhydride is 2,2 bis[4(3,4-dicarboxyphenoxy)phenyl]-propane dianhydride. 
     
     
       6. The composition of claim 4, wherein the diamine is m-phenylene diamine. 
     
     
       7. The composition of claim 4, wherein the agent is a blocked, tri-functional isocyanate. 
     
     
       8. The composition of claim 4, wherein the polyimide is cross-linked with from 0.025 to 0.1 mole of isocyanate agent for each mole of bis-phthalic anhydride in said polyimide. 
     
     
       9. The composition of claim 4, wherein the agent is blocked, toluenediisocyanate trimer. 
     
     
       10. The composition of claim 1, wherein the polyimide is cross-linked with from 0.025 to 0.1 mole of isocyanate agent for each mole of bis(etheranhydride) in said polyimide. 
     
     
       11. The composition of claim 1, wherein the fabric material is glass cloth. 
     
     
       12. The composition of claim 1, wherein there are from 2 to 6 plies of fabric material impregnated with, and adherently united by, the resin binder.